Consider your coffee cake's ingredients and its delicate texture

Before freezing your coffee cake, it's important to consider any special ingredients or toppings. Pay particular attention to any icing you may have, such as a maple powdered sugar drizzle, glaze, or buttercream swirls (like those on coffee cake cupcakes). To prevent damaging these delicate toppings with plastic wrap, freeze the cake on a sheet pan until solid before wrapping slices or the entire cake.
If you usually sprinkle powdered sugar on your coffee cake, wait until after it has thawed to do so—just add the sugar right before serving. Also, keep in mind any fruity additions like raspberries or blueberries. While they freeze well, their colors and juices might leak out as the cake thaws. This typically isn't a major issue, but it's a good idea to thaw the cake slowly in the fridge while still wrapped to catch any excess moisture.
Since one of the main attractions of coffee cake is its light, buttery texture, be careful not to overcrowd your storage container or place other items on top of the cake while it freezes. This could crush the crumb topping or disrupt the layers of streusel filling. In short, aim to avoid squished cake—it's not only unappealing but can also compress the cake's airy crumb structure.
For best quality, freeze your cake up to 3 months

Whether your coffee cake is made using traditional methods or with creative ingredients like sourdough discard, it can be tempting to leave slices in the freezer indefinitely, saving them for an unspecified future occasion. However, while freezing does keep the cake safe to eat, it's best to consume your leftover coffee cake within three months for optimal quality. Storing it longer could lead to moisture issues or freezer burn, which may affect its flavor and texture.
To monitor your coffee cake's shelf life, it's helpful to label the container with the date it was frozen. For the best results, aim to freeze the cake soon after baking. Be sure to let it cool completely before wrapping and storing it. Avoid leaving your coffee cake out on the counter or in the fridge for several days before freezing; the sooner you preserve its freshness, the better.
Preparing coffee cake in advance and freezing leftovers or the entire cake can be a wonderful treat for your future self. You’ll be able to savor the rewards of your baking later on. Just remember to wrap it securely and store it in an airtight container.
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